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Local Dimming: the LED Backlight Revolution

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Written by Marcus Longhans   
Wednesday, 11 March 2009 16:33

Displays with local dimming system are the new frontier in Liquid Crystal devices, performing an amazing contrast ratio and the darkest black ever.
Do you remember when LCD televisions were looked down as the “poor relatives” around image reproduction, crushed by plasma models and by the good old cathode ray tube
Those times are technologically far away, even though not so many years have gone by. Liquid Crystal Technology has definitely filled the gap that was separating it from its competitors and at the moment it seems to have the weapon of choice to be the winner in the war on quality.
The ace up the sleeve is called “Local Dimming” and it works with a LED backlight.
It makes look old and tired not only the plasma devices (being the Crt TV out of the scene) but also the LCD displays begin to look not so fit anymore...

When they appeared in the television market (before, they were mostly used in informatics), Lcd models had clear limitations regarding the contrast ratio, the black level, the chromatic scale, the visual angle and much more.
They also immediately revealed their great advantages, especially around electricity consumption and reliability. As a matter of fact, they don't show the well known and feared phenomenon of the Temporary Image Retention, which plasma often suffer from.
All problems have been by now faced and reduced, except for the first one.
The contrast ratio and the black level have been improved, but the material hindrance of the backlight via the panel bulbs made it impossible to attain the plasma level, since plasma went itself through a great optimization.

That's when the new LED back-light system comes into the play. Due to the onoff device, the dynamic contrast ratio in LCD televisions got a real boost, rising from a 50.0001 (calculated on the best conventional backlight models on the market) to a ratio that was considered impossible until a short time ago, coming close to one milllion to one.
And it is not just bragging about numbers, because such a high dynamic contrast means a black level and a chromatic adherence absolutely extraordinary for liquid crystal devices.

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jrreddig   |93.42.84.xxx |2009-05-22 04:11:35
When I I heard that Samsungs new LED LCDs did not feature local-dimming, I was
dissapointed. Im glad to hear that they will in these B9000 sets. I bet they
will be expensive though: my guess is around 4 grand for the 46.
samuel   |91.187.103.xxx |2010-05-17 17:32:41
Im also glad to hear that but 4 grand????
stickshaka   |93.42.84.xxx |2009-05-22 04:12:58
Haven't you forgotten the Phillips 42PLF9803 which also uses LED's?

Strange
Sony is using the argument of being more expensive because it uses RGB LED's,
yet actually they're cheaper than white LED's.
hafenbrack  - re:   |93.42.84.xxx |2009-05-22 04:14:13
stickshaka wrote:
Haven't you forgotten the Phillips 42PLF9803 which also uses
LED's?

Strange Sony is using the argument of being more expensive because
it uses RGB LED's, yet actually they're cheaper than white LED's.

Yes, but they have 4 times as many LED's and will need much more complex
routines to run those different LED's to go on and off as compared
to the single white LED system.
Sports  - LCD quality   |67.152.66.xxx |2010-02-17 21:56:49
If your just casually sitting down watching a sports game you really wont
notice the tint and quality change until you compare it to
another television on display. For example I was at my friend Cooper's office watching the basketball game with Syracuse getting beat up and he
switched on the other televisions that were brand new and you could
see the quality difference and why this article is so right.
Gwen   |91.187.103.xxx |2010-05-18 11:15:37
I also tried it, not with a sports game though... :P and the results were the
same as yours!
Ardi   |91.187.103.xxx |2010-04-21 10:46:38
Quote:
When I I heard that Samsungs new LED LCDs did not feature local-dimming, I
was
dissapointed. Im glad to hear that they will in these B9000 sets. I
bet they
will be expensive though: my guess is around 4 grand for the
46.


I agree about the local dimming, but 4k for this model would be very
much...
erwin   |91.187.103.xxx |2010-05-18 11:41:06
$4 , 000 for any TV is too much!
billie   |91.187.103.xxx |2010-04-21 20:29:04
$4000 is not so much for a good tv, i mean people who love watching tv should
definitely invest 4 grand on a tv,
S1M0N3   |91.187.103.xxx |2010-05-17 20:21:17
its just a tv, how can u spend 4000 dollars in a tv ???
Yvette  - re:   |91.187.103.xxx |2010-05-17 09:59:49
billie wrote:
$4000 is not so much for a good tv, i mean people who love watching tv
should definitely invest 4 grand on a tv,


No, it's too much, I wouldn't give more than $600 or $700
TwilightFan   |91.187.103.xxx |2010-05-17 16:45:33
For a good tv I would pay up to$1000 and never $4000. With four grand I can rent
a car,

TwilightFan
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